cgconfig.service is to enable configuration for cgroups andcgred.service is to enable configuration for cgroups for processes depending on the name.

Now, we will need to configure the cgroups and configure the groups for the processes. So, lets open up the configuration files and do some configuration:

Here we will use firefox as the group name and use firefox as an example to restrict the memory to 700Mb and cpu to 10%. Since we do not have any other group configured right now, so max being 1024 – 100 shares would be around 10%.

First, open up the /etc/cgconfig.conf file and add the following. You would need to replace below with your username.

To get your email working on your raspberry pi, First thing that you should probably do is to set up outgoing emails from your RPi. The easiest way to do so is with ssmtp.

Install ssmtp:

sudo apt-get install ssmtp

Next configure the ssmtp client to send emails using your ISP, open up the file /etc/ssmtp/ssmtp.conf file and make the changes as suggested below:

#
# Config file for sSMTP sendmail
#
# The person who gets all mail for userids < 1000
# Make this empty to disable rewriting.
root=postmaster
# The place where the mail goes. The actual machine name is required no
# MX records are consulted. Commonly mailhosts are named mail.domain.com
mailhub=
# Where will the mail seem to come from?
#rewriteDomain=
# The full hostname
hostname=
# Are users allowed to set their own From: address?
# YES - Allow the user to specify their own From: address
# We would want this to be on so that we can set the from line
# from scripts as well.
# NO - Use the system generated From: address
FromLineOverride=YES
AuthUser=
AuthPass=